Heat stress is caused by

Heat stress is caused by

• A. The buildup in the body of heat generated by your muscles during work and by a warm or hot work environment.
• B. Cold exposure only.
• C. Lack of oxygen at altitude.
• D. Water intoxication.

Answer: (A)

Heat stress happens when the heat your body generates from physical work, plus heat from the surrounding environment, builds up faster than your body can get rid of it. When you’re active, your muscles produce a lot of heat, and a hot or warm environment makes it harder for your body to cool down through sweating and blood flow to the skin. If cooling keeps up, core temperature can rise, leading to heat-related illness. The other options aren’t about heat buildup: cold exposure causes cold injuries, lack of oxygen at altitude causes hypoxia, and water intoxication is an electrolyte problem from overhydration, not heat accumulation.

Heat stress happens when the heat your body generates from physical work, plus heat from the surrounding environment, builds up faster than your body can get rid of it. When you’re active, your muscles produce a lot of heat, and a hot or warm environment makes it harder for your body to cool down through sweating and blood flow to the skin. If cooling keeps up, core temperature can rise, leading to heat-related illness. The other options aren’t about heat buildup: cold exposure causes cold injuries, lack of oxygen at altitude causes hypoxia, and water intoxication is an electrolyte problem from overhydration, not heat accumulation.